Is there an alternative to Google for syncing conntacts?

Open_Source_Enjoyer

Is there any way to save/sync conntacts to another place then the device internal storage or Google?
I want to sync my conntacts between main and private space and also have a backup in the cloud for the case that my phone breaks down.
Of course I can export them to a file and share this file between profiles, but this is some kind of a unessary hustle.

The only private option for this seems to be Proton Contacts (https://proton.me/support/proton-contacts-mobile)
Its signed and E2EE (besides name and mail, which are not encrypted)
But they currently lack some important features, but they plan to add them:
"Upcoming features

Soon you’ll be able to:

Sync the contacts in your Proton Mail app to the default contact app on your mobile device.
Make Proton Contacts your default contacts app. "

walcnogard

I don't have any suggestions unfortunately but is very much interested in the same thing

brandy078

You could use a provider like mailbox.org and sync with DAVx5

nologo

I use DAVx5 for syncing my contacts and calendar, both of which are hosted by my mail provider posteo.de

You can off course use a different hosting server, or self host. DAVx5 works with a lot of services (including several privacy minded ones): https://www.davx5.com/tested-with

spl4tt

I selfhost a nextcloud instance and sync my contacts and calendar with davx to it. Easy enough

dremelts

I self-host my own Radicale server and use DAVx5 to sync various devices running whatever contact and calendar app is appropriate for the specific OS (Linux, Android etc).

manugraph

Personally I use the cloud services from the Swiss company infomaniak.com.

I'm using "ksuite" in this case.

Yes, it's not self hosted and I have to trust them, but at least my data is not stored in the USA. As far as I've read from them they also have a sympathetic company culture and only belong to their employees.

You can then add the ksuite account to the system and sync contacts and calendar via their tool ksync just as you would have done it with Google previously.

Their cloud storage can be accessed via the WebDAV protocol and can therefore be added to the smartphone with e.g. the file explorer "Material Files".